Simple answer for me. "More than I need".
I used to chase the "flavor of the month", looking for that perfect pistol powder that gave me all kinds of speed and left the pistol cleaner after shooting than when I started.
Rifle powders, the same. Every time someone posted a fantastic load I ran out and bought a pound of that powder.
I now have ONE pistol powder, Power Pistol.
For my .223's, both AR and Bolt action, I now use CFE223
For my 30-06 it's H-4350
For my 308 loads it's CFE223, IMR-4064, or IMR-8208 XBR depending on bullet weight and time of the year.
I still have a supply of Varget but I'm saving my unopened 8# jug for "trading stock" if a good deal shows up locally and the party wants to trade.
Even with primers, I'm consolidating. No more CCI or Fed's, just Tula. If the Tula primers can give me .158 MOA accuracy at 300 yards, why pay more for the BR2's or Fed GMM 210's?